![]() ![]() |
![]() |
![]() Intel and compatable CPU's Programming Information ![]() |
|
Intel SSE MMX2 KNI documentation AMD 64 Bit & Opteron resource on this site Intel Itanium 64 Bit processor Intel 80386 Reference Programmer's Manual Our Partners: |
![]() |
prev: STC Set Carry Flag next: STI Set Interrupt Flag
STD -- Set Direction FlagOpcode Instruction Clocks Description FD STD 2 Set direction flag so (E)SI and/or (E)DI decrement OperationDF := 1; DescriptionSTD sets the direction flag to 1, causing all subsequent string operations to decrement the index registers, (E)SI and/or (E)DI, on which they operate.Flags AffectedDF := 1Protected Mode ExceptionsNoneReal Address Mode ExceptionsNoneVirtual 8086 Mode ExceptionsNone
up:
Chapter 17 -- 80386 Instruction Set |